Yes, they definitely do have individual personalities! Plus, they're great at interacting with us.
(My newest guy thinks he's part salmon. He managed to swim upstream against the outflow, and ended up in his filter. He got stuck there, and all I could think was the TV commercials with the "little old lady" on the floor saying, "Help! I've fallen, and I can't get up!" I dumped the filter contents back into the tank, and fortunately, he was fine. I've now blocked the outflow opening with a bit of sponge.)